Improvement in rotary pumps



G. S. FOLLENSBEE.

Rotary Pumps. l

Patented April 23, 1872.

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IMPROVEMENT lN ROTARVPUMPS. l

Specification forming part of Letters Patent N o. 126,046, dated April23, 1872.

Specification describingan Improved Water- Elevator, invented by GEORGES. FoLLENs- BEE, 'of Philadelphia, Pennsylvania.

Improved Water-Elevator.

, M y invention relates to improvements in. that class ofwater-elevating apparatus in which a propeller or propellers revolve ina casing; and my improvement, which is too fully explained hereafter toneed preliminary description, has been designed with the view ofobviatin g the defects arising from the whirling motion imparted to thewater by the propellers.

In the accompanying drawing, Figure 1 is a vertical section of myimproved water-elevator; Fig. 2, an inverted sectional plan on the line1 2, Fig. l.

The casin g of the elevator consists of a number of alternate-verticaland inclined anged sections, secured together by bolts passing throughthe flan ges, asshown in the drawing. The interiors of the sections b,c, d, and e of this casing are made vertically cylindrical, theseportions being arranged to the left and right alternately, those to theright for receiving the propellers D and Dlon the shaft E, and those tothe left for the propellers F and F on the shaft G; and the cylindricalsections vof the casing communicate with Veach other through theinclined passages or sections f, so that the interior of the casingassumes the zig-zag form represented in Fig. 1. The shafts are caused toturn in contrary directions, as pointed out by the arrows, and theblades of the shaft E are made in the form of a righthandedscrew-thread, while those of the shaft G have blades shaped like aleft-handed screwthread. The lower end of the casing communicates withthe water, which, bythe action of the propellers, is elevated within thecasin g and discharged therefrom through the orifice at the top. Theaction of a propeller within a casing on water has a tendency to elevatethe same, but at the same time to give it a whirling motion by which itsascent is impeded; hence stationary vanes, having an inclination `thereverse of the blades of the propellers, have been arranged in theinterior of the casing to counteract the vwhirling tendency, as in thepatent granted to W. T. Barnes March 20, 1849. While the stationaryvanes, however, accomplished this end, the friction of the water againstthem was such as to absorb a large portion of the driving power, thusdetracting from the apparatus as an economical medium for elevatingwater. In my improvement the whirling of the water by one propeller iscounteracted/by the next propeller above, which, instead of detractingfrom the capacity of the apparatus, adds to the elevating efficiency ofthe same. The whirling of the water beneath the lowermost 'propeller Dis prevented by a plate, which extends across and is secured to or formsappart of the lowermost section of the casing.

I claim as my invention- 1. The combination of a casing and two or morepropellers, arranged one above the other and rotating on differentvertical axes, so that the water raised by one propeller must passdiagonally to the other, substantially as and for the purpose described.

2. A water-elevator, in which are combined two parallelpropeller-shafts, having different axes, carrying propellers, androtating in opposite directions, substantially as herein described.

3. The combination, substantially as described, of the shafts E and G,their propel- 1ers, and the zig-zag casing.

In testimony whereof I have signed my name to this specification in thepresence of two subscribin g witnesses. A

GEO. S. FOLLENSBEE.

Witnesses:

WM. A. STEEL, HARRY SMITH.

